Chip breaker for molding machines and the like



July 31, 1928. 1,678,835

w. o. VIVARTTAS CHIP BREAKER FOR MOLDING MACHINES AND THE LIKE FiledMarch 24, 1924 2 Sheets-Sheet 1 July 31, 1928. 1,678,835

w. o. VIVARTTAS CHIP BREAKER FOR MOLDING MACHINES AND THE LIKE FiledMarch 24, 1924 2 Sheets-Sheet 2 ,FYZJOWEI ZUL'LLmm 0. Uovartlfas,

Patented July 31, 1928.

mire!) STATES PATENT OFFICE.

WILLIAM O. VIVARTTAS, OF ROCKFORD, ILLINOIS, ASSIGNOR TO 'MATTISONMACHINE WORKS, .015 ROCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS.

CHIP BREAKER FOR MOLDING MACHINES AND THE LIKE.

Application filed March 24, 1924. Serial No. 701,278.

The invention has general reference to woodworking machines of the typeemployed in the manufacture of moldings and the like. More specifically,the invention has reference to means commonly termed chip breakers whichare employed in molding machines for preventing the splintering of thewood by the cutting knives.

In the use of such chip breakers, it is desirable that they be locatedas near-as possible to the cutting knives in order more effectually toprevent the splintering of the wood. The cutters vary in accordance withthe work to be produced in that the cutt ng edges of the knives arelocated at varying distances from the cutter axis. Accordingly, it isdesirable that the chip breakerbe capable of being quickly and easily adusted to conform to the particular form of cutter which it may bedesired to employ. It is also desirable that the chip breaker capable ofaccommodating itself to variations in the thickness of the work whichsometimes occur throughout the width of the latter due toimperfections'in cutting and planing the wood.

It is the primary object of my invention to produce a chipbreakercomposed of a plurality of independent units which are capable ofadjustment toward and from the axis of the cutter and also capable ofyielding to compensate for irregularities in the work.

The object of the invention, thus generally stated, together with otherand ancillary advantages, is attained by tllQ'COIlStIllCtlOIl andarrangement illustrated in the accompanying drawings forming parthereof, wherein Figure 1 is a fragmentary plan v ew partiallydiagrammatic in character of a chip breaker constructed in accordancewith my invention and showing it in association with a cutter of amolding machine.

Fig. 2 is a fragmentary end View illustrating the chip breaker.

Fig. 3 is a fragmentary vertical sectional view taken approximately inthe plane of line 33 of Fig. 1.

Fig. 1 is a fragmentary vertical sectional view taken approximately inthe plane of line l-l of Fig. 1.

I Fig. 5 is a similar view taken in the plane of line 55 of Fig. 1.

Fig. 6 is a detail view showing the two sections of a chip breaker unitin detached relation.

For purposes of illustration I have shown my improved chip breakermounted upon the base or frame of a molding machine, in association withone of the cutters. 7 designates the frame and 8 indicatesdiagrammatically the cutter; mounted on a shaft 9 above the frame. Tosupport the shaft, the frame has upon opposite sides bearing heads 10and 11 which may be of any suitable character. comprises knivesprojecting varying dis tances radially of the cutter head, two knivesbeing shown diagrammatically in Fig. 1 as projecting radially'beyondadjacent knives.

The chip breaker comprises a cross head 12 substantially of channel formas indicated clearly in Fig. 4 but with the channel opening downwardy soas to form an'elongated housing-in which the upper ends of a pluralityof independent units 13 are mounted. At its opposite ends the cross head12 is mounted upon the rear ends of a. pair of arms 14 and 14 which inturn are pivoted rearwardly of the axis of the cutter 8 upon uprightsupporting members 15. The arms are of such length and the head mountedthereon in such manner that it is located forwardly of the cutter axis.instance the head issecured at its opposite ends upon the free ends ofthe arms 14, 14 by means of bolts 16 entered through slots 17 inprojecting portions 18 .on the head and anchored in the arms. Lockingbolts 19 entered through elongated slots 20 in the sides of each of thearms are anchored in the ends of the head. It will be apparent that thecross head is thus adjustable as a whole toward and from the axis of thecutter.

The chip breaker herein shown comprises eight independent units 13.These units are sectional in character with spring means interposedbetween the sections so as to permit them to yield vertically, and theunits are also mounted for bodily adjustment in the head for movementtoward and from the axis of the cutter. Thus each of the units comprisesa lower section or shoe 21 and an upper section or hanger 22, and thetwosections are constructed so as to interengage The cutter as usuallyconstructed In the present and are secured together by means of a screw23 and nuts 24. As shown best in Figs. 4 and 6, the shoe is providedwith an upwardly opening recess or groove 25 and the upper section orhanger has a downwardly projecting portion or tongue 26 having a slidingengagement with the walls of said groove. A coiled expansion spring 27is entered in a downwardly opening bore 28 and acts between the twosections so as to yieldably hold the shoe 21 downwardly upon the workwhich. is indicated at a.

The shoe 21 forwardly of the recess or groove 25 has an upwardlyextending tongue portion 29 fitting into a downwardly opening recess orgroove 30 in the upper section of the unit; and the upper section isnotched rearwardly as at 31 to accommodate the upper end of the screw 23and nuts 24 thereon, said screw being entered loosely though a bore 32in the upper section and anchored in the tongue portion 29 of the lowersection. It will be apparent that by adjusting the nuts 24 the spring 27may be placed under varying degrees of tension. In Fig, 4 the spring 27is shown as being under compression but capable of yielding stillfurther to compensate for irregularities in the work. It will also beobserved that the shoe is shaped upon its rear side to conformapproximately to the periphery of the cutter, and that thetoe portion 33of the shoe projects to a point close to the point of engagement of thecutter knives with the work.

In order that the units 13 may be inde pendently adjusted longitudinallyof. the machine, that is to say, toward and from the axis of the cutter,the upper section or hanger is mounted in the head upon two pins or rodsone of which is in the nature of a screw 34 and the other a slide rod35. These pins are disposed one above the other and have their oppositeends mounted in the side walls of the channel. The screw 34 has asquared end 36 projecting from the rear side of the head and'because ofa screwthreaded connection between the screw and the upper section orhanger the unit may be adjusted transversely of the head orlongitudinally of the machine by the application of a wrench to thesquared head 36.

The chip breaker head is also capable of an upward yielding movement asa whole. To this end I connect the forward ends of the arms 14, 14 withthe frame 7 by means of a screw 37 entered through a lug 38 rigid withthe arm 14 and having a releasable connection with the frame. Below thelug the screw carries a nut 38 and a pair of coiled springs 39 areinterposed between the lug and a bearing member 39 loose on the screwand adjustable thereon by a screw-threaded hand wheel 40.

The releasable connection between the screw and the base or framecomprises in the present instance (Fig. 3) a plate 41 to' which thelower end of the screw is pivotally connected as at 42. A plunger 43slidable in an apertured member 44 depending from the plate isoperatively connected to the plate for movement by a hand lever 45 whichis fulcrumed on the plate. The rear end of said plunger slides through ayoke member 46 rigid with the lower end of the screw 37, the oppositeportions or legs of the yoke being apertured for this purpose. The yokeis adapted to straddle an aperturedanchoring lug 47 having a stem 48screw-threaded into a stationary part 49 on the frame. It will beapparent that by operating the lever 45 the pin may be readily withdrawnfromthe lug 47 so as to release the head from the frame and permit itto'be swung upwardly out of theway of the cutter when desired.

To facilitate the swinging of the head I provide aforwardly extendingrod 5O rigid therewith and having a handle 51 at its free end.

The arm 14 has a 111g 56 thereon carrying a stop screw 57 provided witha lock nut 58.

The lower end of this screw is arranged to engage with a stationary partof the frame as at 59 and the screw is adjusted so as to support thehead at the proper distance above the frame, v

In Fig. 4 I have shown a means for yieldingly holding the workdownwardly upon the frame prior to the engagement of the work with thechip breaker. This means comprises, yielding fingers 52 mounted upon anarcuate member 53 which is in turn mounted to swing on a shaft 54 with afeed roll 55.

It will be observed that the chip breaker which I have provided iscapable of operating effectually to prevent the splintering of theworkin the cutting operation. The individual units are adjustableindependent- 1y toward and from-the axis of the cutter so as toaccommodate various forms of out ters, and they are also capableofyielding vertically to compensate for irregularities in the work as itpasses into engagement with the cutter. Moreover, the chip breaker as awhole is adjustable relative to the cutter and is: capable of yieldingwhen an unexpected thickness of the work is encountered.

I claim as my invention:

1. In a molding machine or the like, the combination with a cutter, of achip breaker comprising a cross head located at one side of the axis 'ofthe cutter and mounted to swing on an axis located on the other side ofthe cutter-axis, yieldable means for holding the head in operativeposition, and a plurality of two-part chip breaker'units carried by thehead for individual adjustment toward and from the'axis of thecutter,the lower parts of said units being adapted to yield independently ofeach other in accordance with the varying thicknesses of the worktransversely thereof.

2. In a molding machine or the like, the combination of a cutter, of achip breaker mounted to swing on an axis located at one side of thecutter and having a cross head upon the other side of the cutter axis,sald cross head being of channel form, and a plurality of independentchip breaker units having their upper ends mounted in the channel of thecross head for adjustment across the groove of the channel and towardand from the axis of the cutter, the means for supporting the units inthe cross head comprising slide rods extending transversely of thechannel groove and passing one through the upper end of each unit andadjusting screws also mounted in the cross head and operatively engagingthe upper ends of the units.

3. A chip breaker comprising, in combination, a cross head, and a chipbreaker unit having a shoe portion adapted to engage with the work and ahanger portion mounted on the cross head and adjustable thereonlongitudinally of the machine, said shoe portion being adapted to yieldrelatively to the hanger portion.

4. A chip breaker comprising, in combination, a cross head of channelform, adapted to be positioned with the groove extending transversely ofa machine, a chip breaker unit having a shoe portion adapted to engagewith the work, and a hanger portion entered within the channel of thecross head and adjustable transversely of the groove, said shoe portionbeing adapted to yield relative to the hanger portion.

5. A chip breaker for molding machines and the like comprising a channelshaped cross head adapted to be positioned with the channel grooveextending transversely of a machine, a chip breaker unit comprising ashoe adapted to engage with the work, and a hanger adapted to enter thechannel of said head, a slide rod mounted in the walls of the channeland extending longitudinally of the machine on which the hanger isadapted to slide, and an adjusting screw also mounted in the walls ofthe channel parallel to the slide rod and having ascrew-threadedengagement with the hanger.

6. A chip breaker for wood-working machines comprising a cross head, achip breaker unit comprising a shoe adapted to engage with the work, anadjusting screw journaled in the cross head longitudinally of themachine and having a screw-threaded engagement with said unit, and meanscomprising a rod mounted in the head parallel to said screw for guidingthe said unit for movement in the cross head by said screw.

7. A chip breaker for molding machines comprising, in combination, across head, a

chip breaker unit comprising a shoe and a hanger in, interfittingengagement and having spring means interposed therebetween, adjustablemeans for holding the shoe and hanger in operative association againstthe action of said spring, and means for sup porting the hanger in thecross head.

8. A chip breaker comprising, in. combination, a cross head, and adetachable twopart chip breaker unit, said unit comprising a hangermounted in the cross head, a shoe mounted for up and down Sliding movement relative to the hanger, a spring tending to move the shoedownwardly into engagement with the work, and adjustable means fordrawing the shoe toward the hanger for varying the tension in saidspring and for limiting the downward movement of the shoe.

9. A chip breaker for molding machines and the like comprising a crosshead, a pair of arms to which the opposite ends of the cross head areadjustably secured, a plurality of chip breaker units carried by thecross head for adjustment transversely thereof, said units includinghangers mounted in the head and shoes movably supported by the hangers,and spring means operable to permit the shoes to yield upwardly inoperation.

10. In a molding machine or the like, the combination with a cutter, ofa chip breaker comprising a cross head located at one side of the axisof the cutter and mounted to swing on an axis located on the other sideof the cutter axis, adjustable means for bold ing the head in operativeposition and independent means to release said head from its operativeposition.

11. A chip breaker for wood-working machines comprising a cross head, aplurality of chip breaker units carried by the cross head, said unitsbeing independently yieldable when in operative engagement with thework, and spring means for yieldably holding the cross head and therebythe units in operative relation to the work, said units being adjustableindependently for movement transversely of the cross head.

12. A chip breaker for molding machines and the like comprising a crosshead, a plurality of independent chip breaker units carried by the crosshead, said units being individually adjustable transversely of the crosshead, individual means to adjust each of said units, and means forsupporting the cross head adapted to permit of its adjustment in a frontto rear direction.

13. A chip breaker for molding machines and the like comprising a crosshead, a chip breaker unit comprising a shoe adapted to engage with thework and a hanger mounted on the cross head, a slide rod in the crosshead on which the hanger is adapted to slide longitudinally of themachine, and an loo adjusting screw also mounted in the head slide rodand adapted to adjust said hanger, 10 and having screw-threadedengagement with a shoe in slidable engagement with. said the hanger.hanger adapted to engage, the work,"spring 14:. A chip breakercomprising, in commeans interposed between said hanger and bination, across head, a slide rod mounted shoe, and means to adjust said shoerelative on said cross head, a hanger adapted to slide to said hanger.on said rod, a second rod in soreW-thread- In testimony whereof, I havehereunto ed engagement with said hanger rotatably aflixed my signature.

mounted in said cross head parallel to said VILLIAM O. VIVARTTAS.

